Aspen Aerogels, Inc.
US ˙ NYSE ˙ US04523Y1055

SecurityASPN / Aspen Aerogels, Inc.
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership106,295 shares
Latest Disclosed Value $ 629,266
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series ownership in ASPN / Aspen Aerogels, Inc.

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 106,295 shares of Aspen Aerogels, Inc. (US:ASPN) valued at $629,266 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 106,295 shares of Aspen Aerogels, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $599,504 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2025-08-26 2025-06-30 NP Aspen Aerogels EC US04523Y1055 106,295 0 0.00 629 -7.36 0.0141
2025-05-28 2025-03-31 NP Aspen Aerogels EC US04523Y1055 106,295 5,758 5.73 679 -43.13 0.0163
2025-02-25 2024-12-31 NP Aspen Aerogels EC US04523Y1055 100,537 -14,863 -12.88 1,194 -62.63 0.0261
2024-11-26 2024-09-30 NP Aspen Aerogels EC US04523Y1055 115,400 18,502 19.09 3,195 38.25 0.0604
2024-08-26 2024-06-30 NP Aspen Aerogels EC US04523Y1055 96,898 5,846 6.42 2,311 44.26 0.0471
2024-05-28 2024-03-31 NP Aspen Aerogels EC US04523Y1055 91,052 0 0.00 1,603 11.56 0.0334
2024-02-26 2023-12-31 NP Aspen Aerogels EC US04523Y1055 91,052 4,821 5.59 1,437 93.79 0.0307
2023-11-28 2023-09-30 NP Aspen Aerogels EC US04523Y1055 86,231 -5,420 -5.91 742 2.49 0.0193
2023-08-25 2023-06-30 NP Aspen Aerogels EC US04523Y1055 91,651 12,726 16.12 723 23.17 0.0171
2023-05-26 2023-03-31 NP Aspen Aerogels EC US04523Y1055 78,925 28,887 57.73 588 -0.34 0.0157
2023-02-24 2022-12-31 NP Aspen Aerogels EC US04523Y1055 50,038 0 0.00 590 27.77 0.0162
2022-11-25 2022-09-30 NP Aspen Aerogels EC US04523Y1055 50,038 7,729 18.27 461 10.29 0.0132
2022-08-25 2022-06-30 NP Aspen Aerogels EC US04523Y1055 42,309 8,315 24.46 418 -64.33 0.0115
2022-05-26 2022-03-31 NP Aspen Aerogels EC US04523Y1055 33,994 0 0.00 1,172 -30.73 0.0273
2022-02-25 2021-12-31 NP Aspen Aerogels EC US04523Y1055 33,994 2,259 7.12 1,693 15.89 0.0367
2021-11-24 2021-09-30 NP Aspen Aerogels EC US04523Y1055 31,735 0 0.00 1,460 53.85 0.0322
2021-08-26 2021-06-30 NP Aspen Aerogels EC US04523Y1055 31,735 0 0.00 950 47.13 0.0204
2021-05-27 2021-03-31 NP Aspen Aerogels EC US04523Y1055 31,735 -2,317 -6.80 645 13.56 0.0146
2021-02-25 2020-12-31 NP Aspen Aerogels EC US04523Y1055 34,052 0 0.00 568 52.69 0.0146
2020-11-25 2020-09-30 NP Aspen Aerogels EC US04523Y1055 34,052 0 0.00 373 66.07 0.0120
2020-08-27 2020-06-30 NP Aspen Aerogels EC US04523Y1055 34,052 34,052 224 0.0073
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.